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<p>This paper presents a treatment process for copper smelter dust’s chlorinated leaching solution. Addressing the challenge of separating As and valuable metals from this solution, the process utilized SO<sub>2</sub> to reduce As(V) to As(III) and NaOH to neutralize Bi(III), resulting in the stepwise formation of As<sub>2</sub>O<sub>3</sub> and BiOCl. The results indicate that, under optimal conditions, the precipitation ratio of As reached 71.23%, and the Bi precipitation ratio reached 98.38%. Following Bi precipitation, two separation strategies were attempted for the recovery of Cu and Zn. The first strategy involves recovery of Cu using a sulfide precipitation method, followed by the recrystallization of ZnSO<sub>4</sub>. Under optimal conditions, the Cu precipitation ratio can reach 99.81%. The second strategy involves Cu solvent extraction using Lix984N coupled with Zn solvent extraction using P204. Under appropriate conditions, the Cu extraction rate can achieve 98.59%. A comprehensive assessment indicates that using sulfidation − crystallization to separate Cu and Zn is more economical than employing solvent extraction methods. Consequently, the final process is determined as follows: As removal by SO<sub>2</sub> reduction &gt; Bi recovery by NaOH neutralization &gt; Cu recovery by sulfidation precipitation &gt; Zn recovery by crystallization.</p>

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Removal of As in Copper Smelter Dust’s Chlorinated Leaching Solution by SO2 Reduction and the Subsequent Separation of Bi/Cu/Zn

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • Zhuzhu Guo,
  • Chunhui Gao,
  • Siyuan Wu,
  • Bao Guo,
  • Rongdong Deng,
  • Kaixi Jiang

摘要

This paper presents a treatment process for copper smelter dust’s chlorinated leaching solution. Addressing the challenge of separating As and valuable metals from this solution, the process utilized SO2 to reduce As(V) to As(III) and NaOH to neutralize Bi(III), resulting in the stepwise formation of As2O3 and BiOCl. The results indicate that, under optimal conditions, the precipitation ratio of As reached 71.23%, and the Bi precipitation ratio reached 98.38%. Following Bi precipitation, two separation strategies were attempted for the recovery of Cu and Zn. The first strategy involves recovery of Cu using a sulfide precipitation method, followed by the recrystallization of ZnSO4. Under optimal conditions, the Cu precipitation ratio can reach 99.81%. The second strategy involves Cu solvent extraction using Lix984N coupled with Zn solvent extraction using P204. Under appropriate conditions, the Cu extraction rate can achieve 98.59%. A comprehensive assessment indicates that using sulfidation − crystallization to separate Cu and Zn is more economical than employing solvent extraction methods. Consequently, the final process is determined as follows: As removal by SO2 reduction > Bi recovery by NaOH neutralization > Cu recovery by sulfidation precipitation > Zn recovery by crystallization.